ON ALERT... A nuclear bomb has gone missing. At the same time Room 59, a covert unit of the International Intelligence Agency created to fi ght terrorist cells, intercepts a communiqu?rom U.S. Border Patrol agent Nathaniel Spencer. A known terrorist, thought to be dead, is back in business. ...AND UNDERCOVER Tracy Wentworth is working for the Department of Homeland Security when she's contacted by Room 59 for an inside job. Aligned with Agent Spencer...